<?php
/**
 * Shopware 4
 * Copyright © shopware AG
 *
 * According to our dual licensing model, this program can be used either
 * under the terms of the GNU Affero General Public License, version 3,
 * or under a proprietary license.
 *
 * The texts of the GNU Affero General Public License with an additional
 * permission and of our proprietary license can be found at and
 * in the LICENSE file you have received along with this program.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * "Shopware" is a registered trademark of shopware AG.
 * The licensing of the program under the AGPLv3 does not imply a
 * trademark license. Therefore any rights, title and interest in
 * our trademarks remain entirely with us.
 */

namespace ShopwarePlugins\SwagUpdate\Components\Archive;

use Countable;
use SeekableIterator;

/**
 * @category  Shopware
 * @package   ShopwarePlugins\SwagUpdate\Components\Archive;
 * @copyright Copyright (c) shopware AG (http://www.shopware.de)
 */
abstract class Adapter implements SeekableIterator, Countable
{
    /**
     * @var int
     */
    protected $position;

    /**
     * @var int
     */
    protected $count;

    /**
     * @param int $position
     */
    public function seek($position)
    {
        $this->position = (int) $position;
    }

    /**
     * @return int
     */
    public function count()
    {
        return $this->count;
    }

    public function rewind()
    {
        $this->position = 0;
    }

    /**
     * @return int
     */
    public function key()
    {
        return $this->position;
    }

    public function next()
    {
        ++$this->position;
    }

    /**
     * @return bool
     */
    public function valid()
    {
        return $this->count > $this->position;
    }

    /**
     * @return array|bool
     */
    public function each()
    {
        if (!$this->valid()) {
            return false;
        }
        $result = array($this->key(), $this->current());
        $this->next();

        return $result;
    }
}
